Cytokinin synthesis is maximum in

Options

A. roots
B. leaves
C. shoot tip
D. fruit

Answer

To determine where cytokinin synthesis is maximum, we need to analyze the options provided: root, leaf, shoot tip, and fruit. Here’s a step-by-step breakdown:

### Step 1: Understand Cytokinins
Cytokinins are a class of plant hormones that promote cell division (cytokinesis) and are involved in various plant growth processes. They are particularly important in areas of active growth.

**Hint:** Remember that cytokinins are associated with growth and cell division.

### Step 2: Identify Growth Areas in Plants
Cytokinins are synthesized in areas of active growth, which include meristematic tissues. These tissues are found in regions of the plant that are continuously growing, such as the root tips and shoot tips.

**Hint:** Focus on where cell division occurs in plants.

### Step 3: Analyze Each Option
1. **Root:** The root contains root apical meristem, which is a region of active cell division. Therefore, cytokinin synthesis is expected to be high here.

2. **Leaf:** Leaves are not regions of continuous growth like roots. They do not have significant meristematic tissue, so cytokinin levels are lower in leaves.

3. **Shoot Tip:** While shoot tips do have some cytokinin synthesis, they are more associated with gibberellins, which promote stem elongation rather than cytokinin synthesis.

4. **Fruit:** Fruits are associated with ethylene production, which is involved in ripening rather than cytokinin synthesis.

**Hint:** Compare the roles of cytokinins in each of these plant parts.

### Step 4: Conclusion
Based on the analysis, the area with the maximum synthesis of cytokinins is the **root** due to the presence of meristematic tissue that actively divides.

**Final Answer:** Cytokinin synthesis is maximum in the **root**.